OK... I am an expert at this! We did it last time this Feb. We went from POP to COR with no car, using only Disney transportation. Here is a step list...
1. Tell Bellhop service the night before to pick up your big luggage (stuff that you would have checked on the plane)
2. Gather your small stuff (Carry on size) you will be taking it with you.
3. Go to a park on a bus, taking your small stuff. Try to to chose a park that is not expected to be busy that day and is close to you. (Eg. Don't chose AK if you are in POR)
4. Arrive at chosen park, go to the bus stop of your new resort. (By the way, this has to be done in morning) Usually there will be no one there (along with no bus). If so, got to another bus, ask the bus drive to send one for your new resort, and go back to wait.
5. Arrive at your resort. Check in, get your room key, go to room. The big luggage is probably not there yet. Don't worry, it should be there by the end of the day.
The whole process took about 45-min. to an hour during off peak times. (Excluding step 1, which must be done the night before.) DO THIS IN THE MORNING! You can go to the parks after, and it is much less busy before 12. One more thing, always go up from a lower resort to a higher! Trust me, you do not want to have a Disney hangover before you even leave!
PS. You must have a split stay reservation for this to work.
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